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Mechanical Engineering Objective Questions { Hydraulic Machines }



15. Head developed by a centrifugal pump depends on
A.Impeller diameter
B.Speed
C.Fluid density
D.Both (A) and (B) above

16. Low specific speed of a pump implies it is
A.Centrifugal pump
B.Mixed flow pump
C.Axial flow pump
D.Any one of the above

17. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of
A.High initial and maintenance cost
B.Lower discharge
C.Lower speed of operation
D.Necessity of air vessel

18. Pick up the wrong statement about overall efficiency of a centrifugal pump. It is proportional to
A.Discharge
B.Head
C.B.H.P.
D.1/ B.P.H.

19. The specific speed of a pump is defined as the speed of a unit
A.Of such a size that it delivers unit discharge at unit head
B.Of such a size that it delivers unit discharge at unit power
C.Of such a size that it requires unit power per unit head
D.Of such a size that it produces unit horse power with unit head

20. Delivery head of a centrifugal pump is proportional to
A.Speed (N)
B.N^2
C.N^3
D.1/ N^2

21. Discharge of a centrifugal pump is proportional to
A.Impeller diameter (D)
B.D^2
C.D^3
D.1/ D^3

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